JE pistons pro seal rings

[AC sports]

Does anyone know what material JE use in the pro seal ring packs? Skinny 1 mm x 1.2mm x 2mm.
And what final bore finish grit is best for them?

[ProPower engines]

Call JE tech

[engineguyBill]

As stated above, call JE for this information. JE used to source most of their high performance rings from Perfect Circle/MAHLE, not sure if they are still sourcing from them though.

[piston guy]

The top ring is steel with a composite nitrite coating and the second is a cast iron material. Three piece oil ring chrome steel rails. Wiseco XC is the same.

[sledge]

both use npr as supplier